fignutty,
Normally I put all my figs in the garage but last year I brought a dozen and a half or so plants into the house as I wanted to see if they'd continue to grow with and without a MH lighting system or in my plant room. They didn't do much and were very sluggish come spring. Not one single fig was produced by any of them. They were young trees (one to 1 1/2 years old) however, so I'm not sure what older trees would have done, but my other trees of the same age that went through dormancy in my unheated garage (with windows) produced quite a few figs.